add test for PR 2819

test/language/statements/async-generator/yield-star-promise-not-unwrapped.js

@@ -0,0 +1,41 @@
+// Copyright (C) 2022 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-generator-function-definitions-runtime-semantics-evaluation
+description: >
+  `yield*` in an async generator does not await promises returned by a manually implemented async iterator.
+flags: [async]
+features: [async-iteration]
+---*/
+
+var innerPromise = Promise.resolve("unwrapped value");
+
+var asyncIter = {
+  [Symbol.asyncIterator]() {
+    return this;
+  },
+  next() {
+    return {
+      done: false,
+      value: innerPromise,
+    };
+  },
+  get return() {
+    throw new Test262Error(".return should not be accessed");
+  },
+  get throw() {
+    throw new Test262Error(".throw should not be accessed");
+  },
+};
+
+async function* f() {
+  yield* asyncIter;
+}
+
+f()
+  .next()
+  .then(v => {
+    assert.sameValue(v.value, innerPromise, "yield* should not unwrap promises from manually-implemented async iterators");
+  })
+  .then($DONE, $DONE)